The Stormwater Experts

EmCast - Software for the Holistic Emission Optimisation

The program package EmCast consists of the coupling of the programs:

  •      STORM - software for hydrological modeling of water management systems


  •      STOAT - software for dynamic simulation of WWTPs

It serves to optimize the pollutant loads of combined sewer overflows, storm overflows and sewage treatment plants that are spilled into the receiving water during heavy rain events.

The product EmCast simulates the catchment including combined sewer and wastewater treatment plant with the help of the precipitation forecast. Thus, CSOs can be reduced and the wastewater treatment plant utilization can be optimised. This relieves the receiving waters. The total emissions from heavy rainfall can be reduced up to 30%.

The Programm Package EmCast

  • simulates the catchment area of ​​the WWTP and is equipped with virtual rain recorders that provide continuous precipitation measurements and forecast data

  • performs continuous rainfall-runoff simulation with the STORM program, it calculates the sewage flow, nutrient loads to the WWTP and the combined sewer overflows on base of precipitation forecast data

  • simulates the dynamic behavior of water treatment plant with STOAT, based on the forecasted sewage flow from STORM and determines continuously the expected flow values ​​of the wastewater treatment plant and the frequency and composition of the water entries from the stormwater overflow

  • allows a proactive optimisation of the treatment plant operation (overflow slide, aeration, return sludge pumps, loading of the stormwater overflow, etc ...), thus the operation can be optimised during heavy rainfall and so the loads of CSO, stormwater overflow and WWTP can be reduced

  • The expected rainfall in an area to be determined on the basis of Doppler radar data and virtual rain recorders two hours in advance (see below).

Radar based rainfall prediction and virtual rain recorder

With these precipitation data, inflows to the WWTP are determined in a runoff simulation (see figure below)

Hydrological Model in (STORM)

The information of the forecasted inflow to the treatment plant allows to prepare it for the arrival of large mixed water inflows (e.g. premature increase in ventilation capacity, timely pumping any residue in rain overflow basins, etc.). It is also possible to determine the capacity of the treatment plant in order to achieve the highest possible throughput coupled with a high operational reliability (see the figure below).

WWTP Model in (STOAT)

The WWTP monitoring and control can be done via a web interface, the so-called WebControlDesk.


The Web ControlDesk provides a display of any parameter on any time frame. It can be used also for the presentation of the forecasts (concentrations, flow rates, loads). Furthermore, it provides a simple export of the desired timelines.

All components involved in this system communicate via Open Geospatial Consortium standard (OGC) developed for Sensor Web Enablement (SWE).
The system can be easily expanded and adapted to the most varied needs.

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Products 2
Dipl.-Ing. Franklin Lindow
+49 3342 3595-28